In addition to the eight week prison sentence, Ms Duffy has been issued an indefinite restraining order to keep her away from her brother’s wife.

Yes, she is his wife now. Ms Duffy’s attempt at sabotage was unsuccessful — the couple got married on November 25 last year, as planned.

Ms Hardy and Mr Greatrex on their wedding day.Source:Facebook

They also reported Ms Duffy to the police, and she was charged with harassment.

Ms Duffy admitted to that charge in Plymouth Magistrates Court, saying she was only trying to protect her brother, the BBC reports.

“What we have here is somebody that has pleaded guilty to harassment without violence,” said her lawyer, Roger Page.

“The defendant still takes the view that her brother is not suited to his wife. In desperation, to avoid her brother from making what she regarded as a disastrous move, she cancelled the wedding.”

Ms Duffy had told police she cancelled the wedding to cause distress for her future sister-in-law, not her brother.

She said she was trying to prevent the marriage because she thought Ms Hardy was taking her mother away. Mr Greatrex’s mother had moved in with the couple.

Woman jailed for cancelling brother’...Source:Snapper Media

Prosecutor Will Rose likened Ms Duffy’s actions to an episode of the British soap EastEnders. He said it was “a cruel and vindictive act which left the couple distressed and distraught”, the BBC reports.

The magistrate took a similar view.

“It was a planned, deliberate, spiteful and vindictive offence,” he said.